Extraneous matter removing system for turbine

Abstract

An object of the present invention is to effectively remove extraneous matter adhering to turbine blades without disassembling equipment. A turbine in accordance with the present invention is provided with a pressure gage for detecting the pressure in a steam chamber between a stator blade and a moving blade. In a casing on the upstream side of the stator blade in a duct, a nozzle connected to a high-pressure water generator via a valve is installed. Similarly, in the stator blade, an introduction pipe which is connected to the high-pressure water generator via a valve is provided. The introduction pipe is connected with a nozzle in which many injection ports capable of causing water to flow onto both surfaces of the profile of the stator blade are formed. When extraneous matter adheres to the turbine blades, a control unit detects a rise in pressure via the pressure gage, whereby the control unit opens the valves to remove extraneous matter by means of high-pressure water.

1 . An extraneous matter removing system for a turbine in which turbine blades provided with a moving blade which rotates together with a rotor and a stator blade which is located on the upstream side of said moving blade and is held on the casing side are housed in a duct, and said moving blade is rotated by a fluid introduced into said duct, wherein 
 said system comprises a pressure gage for detecting the pressure in said duct; a first water injection nozzle which is disposed in said stator blade and is connected to a water supply source via a first valve; and a control unit for regulating the opening of said first valve according to the pressure detected by said pressure gage, so that extraneous matter adhering to the surface of turbine blade is removed by water injected from said first water injection nozzle.    
     
     
         2 . The extraneous matter removing system for a turbine according to  claim 1 , wherein said system further comprises means for removing extraneous matter adhering to the surface of said stator blade by injecting water from said first water injection nozzle onto the surface of said stator blade.  
     
     
         3 . The extraneous matter removing system for a turbine according to  claim 1 , wherein said system further comprises means for removing extraneous matter adhering to the back surface of said moving blade by injecting water from said first water injection nozzle to the back surface side of said moving blade.  
     
     
         4 . The extraneous matter removing system for a turbine according to  claim 1 , wherein said moving blade is subjected to surface reforming to prevent said moving blade from being damaged by water injected from said first water injection nozzle.  
     
     
         5 . An extraneous matter removing system for a turbine in which turbine blades provided with a moving blade which rotates together with a rotor and a stator blade which is located on the upstream side of said moving blade and is held on the casing side are housed in a duct, and said moving blade is rotated by a fluid introduced into said duct, wherein 
 said system comprises a pressure gage for detecting the pressure in said duct; a second water injection nozzle which is disposed at a position on the upstream side of the position at which said stator blade is disposed and is connected to a water supply source via a second valve; and a control unit for regulating the opening of said second valve according to the pressure detected by said pressure gage, so that extraneous matter adhering to the surface of turbine blade is removed by water injected from said second water injection nozzle.    
     
     
         6 . The extraneous matter removing system for a turbine according to claims  2  or  5 , wherein said stator blade is subjected to surface reforming to prevent said stator blade from being damaged by the injected water.